<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        var num = [1,2,3,4,5,6];
        var arr = num.reverse(); //反转数组 原数组改变
        
        console.log(num);
        console.log(arr);// 返回值 ：也是反转后的数组
    </script>
</body>
</html>